My idea is to read all children of combo box (loop), then read children of each ListItem(loop) and then find out the selected index thus knowing which option has been selected . Later change it as per requirement.

For doing so I need to store ComboBoxs and ListItems as different variables, how can this be done?

Also I have multiple combo boxes in same page and also in other pages how to identify each as a different, right now I am unable to identify them at all.